I had the same thing happen to me last week, I shoot gold tip expedition hunters and I have shot deer with these arrows and they have not broken.But the other day I was shooting at about dark I had 6 arrows all with the nockturnal lighted nocks on them I shot 5 of them and I had a good group, so I shot the last one and it went over the target and spun unnaturally.I recovered the arrow and found out that it must have been weak and it broke into 3 peices and I found them the same way u did.